JPH0351623Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to a device for quantitatively feeding municipal waste, etc., and is a feeder suitable for breaking and coarsely crushing the handled objects into bags and discharging the crushed materials in a quantitative manner. It concerns dust equipment.

<Conventional technology and its problems> Conventionally, for example, when incinerating municipal waste,
Even with stoker furnaces and fluidized bed furnaces, in order to improve combustion efficiency, it is necessary to crush the waste before supplying it, which requires additional crushing equipment, which increases equipment and operating costs. It was hot.

However, in recent fluidized bed incinerators,
There is no need to pulverize the garbage, and even if the waste is broken into bags and coarsely crushed among the various items to be incinerated, the fluidized bed itself will not turn into sticky small lumps. It has been confirmed through the results and research of each newly built incinerator that it has the property of taking on part of the crushing action of the incinerator, and that it can achieve sufficient combustion efficiency without inhibiting fluidization.

An example of a conventional crushing and transportation device developed under this background is the device of Japanese Patent Publication No. 58-57650. This device is equipped with two parallel screws with opposite threads, and the distance between their axes is
Adjust so that the force to expand the distance between the two axes due to the caught object does not exceed a predetermined limit, coarsely crush large garbage, break bags for garbage, and if the crushing force exceeds the crushing force limit. It has a structure that pushes it back in reverse.

However, in the above-mentioned conventional technology, a two-shaft screw type dust supply device 3 is used, and when garbage is stored from the garbage pit 1 into the storage hopper 12 of the dust supply device 3 by the crane 2, if the garbage is accumulated above a certain level. In this case, the transfer direction of the two-shaft screw is only the transfer force toward the discharge port side, and the dust is compacted on the wall surface of the hopper 12 on the discharge port side, and the crushing effect is performed by the entire length of the two-shaft screw. There are problems such as the need to increase the shaft strength and driving power beyond what is necessary.

In addition, as described above, if unshredable foreign matter is mixed in, the reversal causes the waste to be discharged in a different direction to the outlet, which poses problems such as a longer time for stopping the supply of waste to be input into the incinerator at that outlet.

<Purpose of the invention> The purpose of the invention is to eliminate these drawbacks of the conventional technology, improve the garbage storage hopper function and coarse crushing fixed quantity discharge function, and provide a supply system that eliminates the need to stop the equipment even when unshredable garbage is caught. Our goal is to provide dust equipment.

<Summary of the means> In order to solve the above problems, the present invention has the following features:
A screw is installed on the top of the screw on the discharge port side of a single-shaft or multi-shaft screw type dust feeder, and the axis is parallel to the screw and the screw is fed in the opposite direction to the discharge direction. In addition to coarsely crushing and breaking the bag between the hopper and the bag, the back-feeding screw moves the garbage in the opposite direction, preventing the garbage from becoming compacted on the side wall of the destination port of the hopper discharge device. Moreover, with this structure, the place where the screw is used to roughly crush waste and break bags is only the part where the reverse feed screw is attached, which shortens the time required to remove unbreakable materials.

<Example> An example of this invention will be explained using drawings. Figure 1 shows an example of a municipal waste incineration facility.
Crane 2 throws garbage stored in garbage pit 1
The dust is charged into a hopper 3 by a dust feeder 4, and a fixed amount is supplied to an incinerator 5 by a dust supply device 4. In the incinerator 5, air supplied by a forced blower 6 is ejected into the furnace from a diffuser pipe 7 to flow a fluidized medium such as sand to form a fluidized bed. This allows the waste to be burned within a short time in the fluidized bed.

Reference numeral 8 is a non-combustible material discharge device, 9 is a vibration node, 10 is a medium circulation elevator, and 11 is a non-combustible material discharge conveyor.

FIG. 2 is an overall view of a dust supply device according to an embodiment of this invention. In the dust supply device 4, reference numeral 3 indicates a dust hopper.

In the dust supply device 4, a reverse feed screw 14 according to the present invention is located within a horizontal passage portion 20 which is connected to the bottom of the hopper 3 with most of the screw portion being substantially horizontal, and a portion of the screw portion is located on the front wall of the hopper 3. 3 It will be placed on display inside the hopper from _A.

The relative positions of the reverse feed screw 14 and the transfer screw 13 are set as shown in FIG. 4 in its cross section (-cross section). That is, the screw axes are averaged with respect to each other, and the reverse screw 14 is positioned approximately midway between and above the two axes of the transfer screw 13.

The structure of the dust supply device 4 is further shown in FIGS. 2, 3, and 4.
This will be explained using figures. The dust supply device main body casing 15 forming a horizontal passage is connected to a garbage hopper 3 having a garbage inlet 12, and its discharge port 15A is connected to a garbage chute 18, which switches and separates garbage to be incinerated downward and garbage that cannot be crushed. A damper 19 is provided.

Inside the main casing 15 of the dust supply device 4, there are casings that rotate in opposite directions and rotate in a direction in which the upper sides approach each other, and have sufficient clearance with the casing 16 to avoid getting caught in dust. The secured transfer screw 13 is held.

On the other hand, the reverse feed screw 14 is held in a cantilever manner above the discharge port 15, and is configured to be twisted so that it is transferred in the opposite direction to the transfer screw 13. The positional relationship between the transfer screw 13 and the reverse feed screw 14 is as shown in FIG.
The garbage and large garbage stored in bags are disposed in close proximity to the two screws 13 and 14, and are broken into bags and coarsely crushed by the shearing action of the transfer screw 13 and the reverse screw 14, and then sent to the discharge port 15. Transfer and discharge.

When unshredable garbage, such as metal, is thrown in, the torque or current value generated when the garbage is caught between the transfer screw 13 and the reverse screw 14 exceeds the set torque is detected, and the reverse operation is performed. By stopping the feeding screw 14, the liquid is transferred and discharged to the discharge port 15. At this time, the switching damper 19
To take out the unshredable garbage, change the input direction during normal operation.

<Example 2> This invention provides a reverse feed screw at the upper part of the discharge port side of the screw type dust supply device, which provides a coarse crushing effect and an effect of reducing garbage consolidation in the hopper. The speed of each axis of the dust feeder is changed to create a coarse crushing effect, and in addition to this, the width dimension between the screw shafts is changed to remove uncrushable foreign substances, which are too coarsely crushed and cannot be crushed. However, if the structure is designed to allow escape, a more desirable effect will be produced.

<Effects of the invention> By implementing this invention, it is possible to handle items that are a mixture of solids of various sizes, such as municipal waste, or items that contain solids contained in bags, by tearing the bags, Moreover, it is possible to roughly crush large-sized garbage and supply it in a fixed quantity to the next process such as an incinerator, and it also prevents the consolidation of garbage in the hopper, making effective use of the hopper capacity, and provides a separate pile for uncrushable materials. It has various effects such as:

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a dust supply system of a municipal waste incineration facility, Fig. 2 is a vertical sectional view showing details of the structure of a dust supply system according to an embodiment of this invention, and Fig. 3 is a plan view. , FIG. 4 is a cross-sectional view of FIG. 2 showing the positional relationship between the transfer screw 13 and the reverse feed screw 14. 1... Garbage pit, 2... Loading crane, 3...
...Hopper, 4...Dust supply device, 13...Transfer screw, 14...Reverse feed screw.

Claims (1)

[Scope of utility model registration request] A hopper for receiving garbage such as municipal waste, a horizontal passage extending horizontally in the garbage transport direction at the bottom of the hopper, a chute connected to the opening of the horizontal passage, and a part of the chute inside the horizontal passage. A dust supply device comprising a set of transfer screws that are positioned and rotated in mutually opposite directions so that their upper ends approach each other,
A dust supply device characterized in that it has a reverse feed screw located in the horizontal passage above the set of transfer screws and provided in the hopper.